A bit hesitation - Impala Tech
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post #1 of 11 (permalink) Old 11-10-2010, 11:28 PM Thread Starter
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A bit hesitation

Hey guys,

The new '62 is running VERY solid except for this one thing...

It seems as if I floor it from a stand still... It will hesitate to move and lack power. I hear a "pshh" sound similar to a blow off valve off a turbo. The sound happens about 2-3 times as the car hesitates to gain power.

This also happens when I'm driving lets say 30-40 mph and I give it sudden gas to pass a car.

If I run the car and gain speed slowly it runs fine.. but any sudden burst of the acc will result in this problem..
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post #2 of 11 (permalink) Old 11-11-2010, 08:48 AM
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Possibly the accelerator pump is bad
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post #3 of 11 (permalink) Old 11-11-2010, 09:55 AM
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Quote:
Originally Posted by Txbobcat View Post
Possibly the accelerator pump is bad
Ditto! If not that, try adjusting your floats.

'63 Impala Sedan
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post #4 of 11 (permalink) Old 11-11-2010, 11:11 AM
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Check the timing also.

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post #5 of 11 (permalink) Old 11-11-2010, 12:30 PM Thread Starter
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Is there a way to test the accelerator pump? Also... where is it located? I called my local guy I buy parts from and he has one in stock... but I have no idea were to find it under the hood. Anything else I should check while I'm under there?
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post #6 of 11 (permalink) Old 11-11-2010, 02:20 PM
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(a): the accelerator pump is in the top of your carburetor, - "(see picture) depending on what carb you're running. It's long, thing, has a spring (i think) and a plunger-type thing at the end of it.

(b) What engine / carb do you have?

(c) the "Psssh" sound ... Hmm.. have you checked all your vacuum connections? That'd certainly cause a hesitation I think if one's not connected ... let us know!
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'63 Impala Sedan
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post #7 of 11 (permalink) Old 11-11-2010, 10:08 PM Thread Starter
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Just got to thinking. It its related to the carb (which seems stock).... I'm just going to buy a new one. Which Edelbrock carb would you guys recommend for my '62 with a 283? My price on lets say a Edelbrock 1406 (electric choke) is around $120. Would that model be the best one for my application? I'm running headers and exhaust, but besides that pretty stock with no plans for big performance upgrades.

Let me know your thoughts. And yes, Mitch... vacuum lines are all good
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post #8 of 11 (permalink) Old 11-12-2010, 11:39 AM
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I think that the 1406 is what I just put on my 283 with headers, and otherwise stock engine.

It was a little larger in size than what I would have preferred but I think it's going to be ok. (It's 600cfm)

So far, mine is doing fine but I'm only driving up and down the driveway right now.
I'm not sure if the standard jetting will be ok, but it should be pretty close.
I did tweak my idle mixture screws on the front to achieve highest vacuum readings though.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #9 of 11 (permalink) Old 11-12-2010, 01:57 PM Thread Starter
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Allan, Would there be able Carb that Edelbrock makes that you would recommend for me over the 1406?
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post #10 of 11 (permalink) Old 11-12-2010, 11:26 PM
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my preference for a 283 that doesn't rev much would have been the 500cfm model but I got a killer deal on my intake/carb combo so I couldn't pass it up.

Here's an Edelbrock 500cfm...
http://www.summitracing.com/parts/EDL-1403/

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #11 of 11 (permalink) Old 11-14-2010, 04:40 PM Thread Starter
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Ok... 1403 it is. Thanks for the input! *PURCHASED*
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